This gets rid of treeview includes in a number of places.
#include "gtktexthandleprivate.h"
#include "gtktextutil.h"
#include "gtktooltip.h"
-#include "gtktreeselection.h"
-#include "gtktreeview.h"
#include "gtktypebuiltins.h"
#include "gtkwidgetprivate.h"
#include "gtkwindow.h"
#include "gtkapplication.h"
#include "gtkapplicationwindow.h"
-#include "gtktreeview.h"
#include "gtkliststore.h"
#include "gtkwidgetprivate.h"
#include "gtkactionmuxerprivate.h"
#include "type-info.h"
#include "gtktypebuiltins.h"
-#include "gtktreeview.h"
#include "gtkbuildable.h"
#include "gtklabel.h"
#include "gtkframe.h"
#include "gtktreelistmodel.h"
#include "gtktreeview.h"
#include "gtktreeselection.h"
-#include "gtktreestore.h"
#include "gtktreemodelsort.h"
#include "gtktreemodelfilter.h"
#include "gtkwidgetprivate.h"
#include "prop-editor.h"
-#include "gtkcelllayout.h"
-#include "gtktreeview.h"
-#include "gtktreeselection.h"
#include "gtkpopover.h"
#include "gtksearchentry.h"
#include "gtklabel.h"
#include "gtkstack.h"
#include "gtkeventcontrollerkey.h"
#include "gtklayoutmanager.h"
-#include "gtklistbox.h"
#include "gtksizegroup.h"
#include "gtkroot.h"
-#include "gtkgestureclick.h"
#include "prop-holder.h"
#include "window.h"
#include "gtksearchentry.h"
#include "gtkstack.h"
#include "gtktextbuffer.h"
-#include "gtktreeselection.h"
-#include "gtktreestore.h"
#include "gtkeventcontrollerkey.h"
#include "gtkpicture.h"
#include "gtkmediafile.h"